PROCOOL TV440E / 1U Rack Mount Exhaust Fan/High Power Cooling System Network Servers Data Center Industrial 19" Rack Cabinets 1U One rack space - 19" x 1.75" x 2" 4 High Power TV40 (TURBO) Fans Airflow = 28 CFM (EXHAUST) Noise = 32 dBA 2 Year Warranty - Built by hand in the USA